I would be nervous about using metals.
the air goes up the pipe in the center (drilled with holes) and that creates a
suction pulls stuff thru the filter. Ingrid

(George Thompson) wrote:
I'll use some lead. Should the bubbles come out of the holes in the
foam or like my wonderful small fishtank one, have the air source
slightly above the holes so it sucks the water through the filter?


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